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Plane and spherical trigonometry.

APA Citation

Richardson, M., Hedrick, E. R. (Earle Raymond). (1950). Plane and spherical trigonometry. New York: Macmillan.

Richardson, Moses, 1911-1968, and E. R. (Earle Raymond) Hedrick. Plane And Spherical Trigonometry. New York: Macmillan, 1950.

Warning: These citations may not always be complete (especially for serials).